Repair navigation links

On [the homepage layout](https://github.com/codeforamerica/brigade/blob/master/app/views/layouts/homepage.html.erb):
* Simplified the links under "How it works" on the homepage since their addresses can be reached from the root directory.

On [the Connections page](https://github.com/codeforamerica/brigade/blob/master/app/views/pages/connect.html.haml):
* Created an empty h2 tag to improve table spacing. More information available here: 1bde879

In [the footer](https://github.com/codeforamerica/brigade/blob/master/app/views/shared/_footer.html.erb): 
* Changed link to the license page to a relative address.

In [the navigation bar (header)](https://github.com/codeforamerica/brigade/blob/master/app/views/shared/_navigation.html.erb):
* Changed the links to use page_path() to get their correct addresses. They were broken on pages like "deployed_applications" that aren't in the root directory.
* Removed the unused (commented-out) code for the Home button.


As always, please let me know if you think this should be done differently!